2020 Fall Meeting
Sep 16 - Sep 18, 2020Online
2020 Fall Meeting
Sep 16 - Sep 18, 2020Online
[2A17]Investigation on distribution of radioactive substances in Fukushima(17)Long-term behavior of radiocesium-137 in river sediments in eastern Japan
*Yuichi Onda1, Tang Chen1, Gao Xiang1, Keisuke Taniguchi1, Yukio Takeuchi2, Momo Kurihara3, Katsumi Hirose1(1. CRiED, University of Tsukuba, 2. Fukushima Pref. Env. Creation C., 3. QST)
Keywords:
Cs-137,river sediment
We summarized particle-size collected Cs concentration of bottom sediment samples (MOE, 461 sites), SS samples (30 sites) around Fukushima affected area. We found the logarithm of the initial inventory was found to be negatively correlated with the rate of decline of Cs-137 in the sediment. The sediment of Cs-137 and the Kdac of SS were found to be similar over time. These results suggest that initial fallout conditions and temporal factors also influence the decline in Cs-137 contamination levels in river systems.